Synonyms of emotionlessness

1 Syllable
phlegm
3 Syllables
apathy, unconcern, stolidness
4 Syllables
resignation, disinterest, passiveness, passivity, incuriousness, stolidity
5 Syllables
indifference, impassivity, insensibleness, incuriosity
6 Syllables
unresponsiveness, impassibility